RSC Advances
·
2020
·Vol. 10
·期 14
·8558-8567
·
IF 3.119
Jindong Wang,Wenzhi Li,Huizhen Wang,Ajibola Temitope Ogunbiyi,Xiaomeng Dou,Qiaozhi Ma
To improve the utilization of lignin, much effort has been devoted to lignin depolymerization with the aim to decrease waste and enhance profitability. Here, a dual property (acid and base) catalyst, namely S2O82−–K2O/TiO2, was carefully researched. Upon loading S2O82− and K2O onto TiO2, acid and base sites emerged, and S2O82− and K2O mutually enhanced the acid and base strengths of the catalyst enormously; this indeed facilitated lignin depolymerization. Under appropriate conditions, the yields of liquid product, petroleum ether soluble (PE-soluble) product and total monomer products were 83.76%, 50.4% and 28.96%, respectively. The constituents of the PE-soluble fraction, which are mainly monomers and dimers, can be used as liquid fuels or additives. In addition, after the catalyst was modified by Ni, better results were obtained. Surprisingly, it was found that the Ni enhanced not only the hydrogenation capacity but also the acidity. The highest high heating value (HHV) of the liquid product (33.6 MJ kg−1) was obtained, and the yield of PE-soluble product increased from 50.4 to 56.4%. The product can be utilized as a fuel additive or be converted to bio-fuel. This catalysis system has significant potential in the conversion of lignin to bio-fuel.
研究领域:
化学工程
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可再生能源
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催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Chen-Yan Hu,Yuan-Zhang Hou,Yi-Li Lin,Yan-Guo Deng,Shuang-Jing Hua,Yi-Fan Du,Chiu-Wen Chen,Chung-Hsin Wu
The degradation rates and kinetics of one commonly used iodinated contrast medium, iohexol, were investigated and compared during ultraviolet (UV) photolysis, UV/H 2 O 2 and UV/ S 2 O 8 2 − advanced oxidation processes (AOPs). Results indicate that the iohexol degradation rate increased in the order of UV/H 2 O 2 < UV irradiation < UV/ S 2 O 8 2 − and followed pseudo-first-order kinetics. Increasing persulfate concentration significantly increased iohexol degradation rate, whereas increasing H 2 O 2 concentration caused reverse effect. Radical scavenging test results show that UV photolysis, OH and radicals all contributed to iohexol degradation during UV/ S 2 O 8 2 − , but OH was the main contributor during UV/H 2 O 2 and was consumed by excess H 2 O 2 . The kinetic models of iohexol degradation by both AOPs were developed, and the reaction rate constants with OH and were calculated as 5.73 (±0.02) × 10 8 and 3.91 (±0.01) × 10 10 M −1 s −1 , respectively. Iohexol degradation rate remained stable at pH 5–9 during UV irradiation and UV/H 2 O 2 , but gradually decreased at pH 5–7 and remained stable at pH 7–9 during UV/ S 2 O 8 2 − . The presence of anions displayed inhibitory effects on iohexol degradation during UV/ S 2 O 8 2 − in the order of Cl − > HCO 3 − ≫ S O 4 2 − . UV/ S 2 O 8 2 − AOP exhibited high degradation efficiency and stability on the basis of UV irradiation, which can be applied as a promising degradation method for iohexol. UV/ S 2 O 8 2 − AOP can effectively mineralize iohexol to CO 2 but promoted the generation of toxic iodoform (CHI 3 ), and the subsequent chlorination had the potential to reduce the content of disinfection by-products; therefore, further evaluation of possible environmental hazards is warranted.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Panpan Xu,Tingting Xu,Mingguang Ma,Xia Qiu,Yue Wang,Yinggui Zhu
This work presents a method for the establishment of a highly sensitive and selective nalidixic acid and S 2 O 8 2− (NA/S 2 O 8 2− ) electrochemiluminescence (ECL) system using isonicotinic (INH) as a co-reaction accelerator. After optimizing the experimental conditions including scan rate, pH value of buffer solution, concentration, etc., the chemiluminescence mechanism of the system was studied in detail using fluorescence spectroscopy, ECL spectroscopy and cyclic voltammetry (CV). The results show that INH is an efficient co-reaction accelerator, which interacts with the co-reactant S 2 O 8 2− but not the luminophore NA to promote the production of more oxidant SO 4 ·– , which then further reacts with NA to generate excited state species NA* with strong ECL signal, indicating that co-reaction accelerators can provide a simple, efficient, and low-cost method for signal amplification. Based on the great ECL enhancement of INH for the NA/S 2 O 8 2− system, under the optimal experimental conditions, highly sensitive and selective electrochemiluminescence detection of tetraethylenepentamine (TEPA) was achieved.
研究领域:
分析化学
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药物分析
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2016
·
IF 3.847
Hui-Gang Wang,Guo-Liang Shi,Feng Yu,Rui-Feng Li
A solid super acid catalyst, S 2 O 8 2 − /ZrO 2 , was prepared by a new synthesis route of one-pot method with ammonium persulfate via vapor phase hydrolysis to improve biodiesel production using expired soybean oil as reactant. Catalysts were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), and NH 3 -temperature programmed desorption (NH 3 -TPD) to determine the optimum pretreatment conditions and understand the role of the active sites for transesterification . S 2 O 8 2 − /ZrO 2 calcined at 500 °C, which showed an amorphous phase by XRD characterization, was identified as composed of tetragonal phase ZrO 2 microcrystallites by TEM examination. The microcrystallites which anchored more S 2 O 8 2 − had abundant super acid and displayed high catalytic activity in the transesterification under mild reaction conditions. The reaction parameters over the catalyst were optimized and both the conversion of soybean oil and selectivity of biofuel reached 100% under the conditions of 110 °C of reaction temperature, 4 h of reaction time and 20:1 of methanol to oil molar ratio . Moreover, the catalyst showed high stability in the reactions and no sulfur leaching was found in the biodiesel products in cyclic utilization.
研究领域:
化学工程
·
催化
·
生物燃料
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Jun-Ming Hong,Yu-Feng Xia,Qian Zhang,Bor-Yann Chen
The present study is to investigate the treatment of a disinfectants wastewater containing benzalkonium chloride (BAC) by S 2 O 8 2− /Fe 2+ process and microbial fuel cell (MFC) system was applied as bio-sensor for the toxicity test of degradation products. The operating oxidation conditions have been optimized. The optimal condition for the degradation of BAC were: pH = 5.0, [S 2 O 8 2− ]/[ Fe 2+ ] = 1:2, the removal rate of BAC reaches 91.45%, and the COD removal efficiency was 52.46% after 60 min. The degradation intermediates were identified by GC–MS and the degradation pathway of BAC was proposed. The toxicity and biodegradability of intermediates of BAC after being treated by S 2 O 8 2− /Fe 2+ oxidation was analyzed by MFC system. The generated power of MFC system was closely related to the initial concentration of BAC. The voltage output and maximal power density were increased from 25.42 mV and 1.01 mW/m 2 to 37.80 mV and 12.13 mW/m 2 after 100 mg L −1 BAC was treated by S 2 O 8 2− /Fe 2+ oxidation process. These results indicated that the S 2 O 8 2− /Fe 2+ oxidation shows positive effect for enhancing the biodegradability of intermediates.
研究领域:
环境科学
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毒理学
·
废水处理
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2020
·Vol. 167
·期 10
·107505
·
IF 3.721
Peijin Wang,Qian Wu,Caixia Wang,Yuxin Pu,Mao Zhou,Mingxiao Zhang
In this work, a sensitive polyethylenimine functionalized Perylene derivative PTC-PEI, S2O82− and 3D flower-like MoS2 (3D MoS2 NFs) ternary system was fabricated for quantitation of Methotrexate (MTX) based on the quenched electrochemiluminescence (ECL) signals. Specifically, the PTC-PEI was prepared via cross-linking Perylenetetracarboxylic acid (PTCA) and polyethylenimine (PEI). Then, the hybrid nanocomposite PTC-PEI-MoS2 was synthysized through electrostatic absorption effect between PTC-PEI and 3D MoS2 NFs. With the excellent catalytic effect of 3D MoS2 NFs towards the electrochemical reduction process of S2O82− thus resulting in generation of more sulfate radical anions (SO4·−), the ECL signal probe PTC-PEI-MoS2 exhibits higher luminous efficiency compared with PTC-PEI (3-fold enhancement). In addition, electrochemical regenerable property of Mo6+/Mo4+ active sites endows 3D MoS2 NFs excellent signal enhancement efficiency. Under the optimum conditions, a linear range from 10 μM to 1pM with the limit of detection down to 0.15 pM could be obtained in MTX determination. Notably, the proposed strategy provides a new idea for sensitive determination of MTX.
研究领域:
分析化学
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纳米材料
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电化学
·
生物传感器
✓ 已验证
产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2015
·
IF 1.587
Xin-Ping Ouyang,Yun Yang,Guo-Dian Zhu,Xue-Qing Qiu
The lack of suitable lignin model compound limits the understanding of the characteristics of lignin, and hence hinders the efficient utilization of this kind of bioresource. A tetramer phenolic lignin model compound composed of 5-5, α - O -4 and β -5 linkages was prepared by a two-step of free radical reaction with hydrogen peroxide/horseradish peroxidase and S 2 O 8 2− /Fe 2+ as the initiator. Compared with enzymatic process, this synthetic process gives a higher yield of 33.8% within a shorter time. HRMS and 13 C NMR spectroscopy show that synthesized model compound contains phenylpropane structure linked by 5-5, α - O -4 and β -5 bonds, which can mimic some chemical characteristics of lignin.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2022
·
IF 5.089
Changhui Zhu,Kaiqiang Wang,Jia Luo,Baohe Tian,Jialin Sun,Xinhong Liu,Wenchao Zhu,Zhiyun Zou
α -Aromatic amino acid esters are important platform compound for drugs, sweeteners and fluorescent sensors. Due to the amphoteric dissociation and steric effect, the esterification of α -aromatic amino acids is difficult. Here, a green and efficient solid superacid, SO 4 2− -S 2 O 8 2− /SnO 2 -Nd 2 O 3 (SSSN), was synthesized and firstly used for the methyl esterification of α -aromatic L-tyrosine and L-tryptophan. The methyl esters yield was optimized with the highest L-TyrOMe yield of 93.1% and L-TrpOMe yield of 92% over SSSN-650 (SO 4 2− -S 2 O 8 2− /SnO 2 -Nd 2 O 3 calcined under 650 °C). Furthermore, it was clarified that the doping of Nd enhanced the electron-withdrawing inductive effect of SO 4 2− /S 2 O 8 2− with increased Brønsted and Lewis acidity, which were beneficial to the esterification of L-tyrosine and L-tryptophan. Besides, Nd-doping reduced the activation energy during L-Tyr esterification by kinetics study. Finally, SSSN-650 could be recycled six times with > 70% of their initial ester yield. The decrease of catalyst activity was caused by carbon deposition and species leaching. This work launched a novelty, rapid and environmental-benign technology for the esterification of α -aromatic amino acid using solid superacid.
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN REACTION KINETICS AND MECHANISM
·
2017
·
IF 0.682
Hua Song,Shengnan Li,Hualin Song,Feng Li,Huapeng Cui
A number of Zn–S2O82–/ZrO2–Al2O3 (Zn(x)–SZA) catalysts with different Zn mass fractions were synthesised and characterised by using X-ray diffraction, the Brunauer–Emmett–Teller method, and H2 temperature-programmed reduction. The structure and isomerisation performance of Zn(x)–SZA catalysts were studied using n-pentane as a probe reaction. The results showed that a pure tetragonal ZrO2 phase was formed on Zn(x)–SZA, and the ZrO2 crystallite sizes of the tetragonal phase increased in the order: Zn(0.5)–SZA < Zn(1.0)–SZA < Zn(1.5)–SZA < Zn(2.0)–SZA < SZA. Zn can strengthen the interaction between persulfate ions and the support, promote the formation of stronger acidity, lead to a better dispersion of sulfate ions on the surface, and improve the redox performance of the catalysts. The Zn(1.0)–SZA catalyst exhibited the best catalytic activity for n-pentane isomerisation. At a temperature of 170 °C, a reaction pressure of 2.0 MPa, a molar H2/n-pentane ratio of 4:1, and a weight hourly space velocity of 1.0 h−1, the isopentane yield reached 58.0%.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 27
·期 2
·429-440
·
IF 1.947
Wang Yunjie,Yuan Hong,Zhang Zhi,Ke Yihu
A series of ordered mesoporous S 2 O 8 2−/ ZrO 2 –SiO 2 (OMSZS) solid superacids with different calcination temperatures (400–650 °C) was synthesized using zirconium n-propoxide and tetraethyl orthosilicate as the raw materials and P123 as a structure-directing agent by solvent evaporation-post-dipping method. Transmission electron microscopy and small-angle X-ray diffraction results showed that the OMSZS were all ordered. The nitrogen adsorption results indicated that the specific surface area of OMSZS could reach up to 331–385 m 2 /g, whereas the average pore diameters were in the range of 3.1–3.2 nm. The pyridine infrared results mainly displayed Lewis acids, and the ammonia (NH 3 )-temperature programmed desorption characterization showed that the NH 3 desorption of the OMSZS calcined at 550 °C was 61 cm 3 /g STP. The catalytic performance of the OMSZS was investigated by the transesterification reaction of waste frying oil and methanol. The yield of fatty acid methyl ester could reach up to 94% at 200 °C reaction temperature for 6 h. After repeated use for four times, the catalyst still featured good activity and the yield was 78%.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2017
·
IF 6.942
Haoxuan Li,Yili Wang,Huaili Zheng
The feasibility of using Fe 0 /S 2 O 8 2− conditioning (zero valence iron (ZVI)/persulfate (ps)) integrated with horizontal electro-dewatering (HED) to improve the dewaterability of activated sludge (AS) was evaluated. The removal and migration of free and bound water in the ZVI/ps–HED process were determined, along with the organic matter migration between the solid and liquid phases of AS biosolids . Results showed that the optimum conditioning dosages were determined as 0.35 g ZVI/g dry solids (DS) and 0.15 g ps/g DS on the basis of capillary suction time variation. The lowest final water content (WC) of 83.67% in AS occurred after the HED treatment at 40 V and 120 min as determined using the response surface methodology . Despite the disruption of AS flocs and microbial cells through SO 4 − · oxidation during the ZVI/ps conditioning, the particle size and mass fractal dimension of the AS flocs remained relatively stable as the zeta potential increased from −8.5 mV to −4.6 mV. The coagulation of Fe 3+ from the oxidation of Fe 2+ by ps contributed to the relatively stable condition, which favored the subsequent momentum of the electroosmotic flow. Moreover, the ZVI/ps conditioning decreased the bound water content (BWC, from 1.83 g/g DS to 1.38 g/g DS) and increased the free water content (FWC, from 60.27 g/g DS to 60.91 g/g DS), indicating a transformation from free water to bound water. After the ZVI/ps–HED process, the FWC and BWC were removed significantly with ratios of 96.32% and 79.78%, respectively. Along with water removal through the ZVI/ps–HED process, the organic matter in the supernatant/filtrate initially increased and further rose at the HED stage. The analysis of the extracellular polymeric substance (EPS) content showed that the proteins (PNs) and polysaccharides (PSs) at the liquid and solid phases decreased due to oxidative degradation. Furthermore, the ZVI/ps stage significantly reduced the PNs content of slime to 57.22%, the PSs content of EPS to 68.50%, and the PN-like substances in the slime and tightly bound EPS to 74.90% and 52.47%, respectively. In addition, the WC of AS correlated with the contents of PN and microbial by-product-like material in slime, as well as tryptophan in TB-EPS, and the low EPS content in AS indicated good dewaterability. Thus, ZVI/ps should be selected as a pretreatment prior to HED.
研究领域:
环境科学
·
污水处理
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Yifan Li,Zhenkai Wang,Jing Lei,Sheng-Peng Sun
Activation of S 2 O 8 2− by Fe 2+ is suppressed under non-acidic pH conditions, strongly hindering its application for water purification. To this end, this study reported an efficient photo-Fenton activation of S 2 O 8 2− by Fe 3+ -tartaric acid complex at circumneutral pH. The results showed that UVA irradiation induced a rapid photogeneration of Fe 2+ from Fe 3+ -tartaric acid complex at circumneutral pH, by which efficient photo-Fenton activation of S 2 O 8 2− was obtained to generate sulfate radical (SO 4 •- ), as evidenced by radical quenching study in combination with electron spin resonance measurement. The process efficiency was optimized in terms of the tartaric acid:Fe 3+ ratio, Fe 3+ -tartaric acid complex dosage, S 2 O 8 2− dosage and UV fluence. Notably, the photo-Fenton catalytic efficiency of Fe 3+ -tartaric acid (1:1) complex for S 2 O 8 2− was comparable to the Fe 3+ -EDDS (1:1) and Fe 3+ -citric acid (1:1) complexes, and more efficient than the Fe 3+ -NTA (1:1), Fe 3+ -EDTA (1:1), Fe 3+ -oxalic acid (1:1) and Fe 3+ -malonic acid (1:1) complexes. It is noticed that the process efficiency can be hindered by the presence of humic acid, phytic acid and HCO 3 − . Nevertheless, almost complete degradation of carbamazepine in actual secondary effluents at environmental relevant concentration was obtained under the optimal conditions of 100 μM Fe 3+ -tartaric acid (1:1) complex, 2 mM S 2 O 8 2− , pH 5.0–6.0, 25 °C and UV fluence of 5.0 J cm −2 . By considering the promising photo-Fenton catalytic efficiency and environmentally benign manner of Fe 3+ -tartaric acid complex, it has large potential application for the treatment of emerging micropollutant in water.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）